public class Demo1 {
    private static Object locker1 = new Object();
    private static Object locker2 = new Object();

    public static int count = 0;
    public static void main(String[] args) throws InterruptedException {
        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 5000; i++) {
                synchronized (locker1){
                    count++;
                }
            }
        });

        Thread t2 = new Thread(() ->{
            for (int i = 0; i < 5000; i++) {
                synchronized (locker2){
                    count++;
                }
            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();

        System.out.println(count);
    }
}
